Spark plug



Dec. 26, 1933. A. GUZIEL ET AL SPARK 4 PLUG Filed June 3, 1952 //v VENTOR HLEXHNDER GUz/EL HRWOL D KURT? A TTOANEY Patented Dec. 26, 1933 Parent oFFioE SPARK PLUG Alexander Guziel andcArnold Korfl, Hollywood,

Application June 3, 1932. Serial No. 615,154-

1 Claim. (Cl. 123-169) This invention relates to improvements in spark plugs for use in conjunction with internal combustion engines and has for its principal object to provide a spark plug wherein the intensity of the spark may readily and easily be changed without the removal of the plug from the engine cylinder.

Another object of the invention is to provide a spark plug wherein the sparking and intensity of the spark is visible so that proper working of the spark plug maybe ascertained without removal of the plug from the engine cylinder.

Still another object of the invention is to provide a foolproof spark plug wherein both points and their lead wires are arranged within an insulating core to align the spark with respect to the axis of the spark plug and to eliminate welding of one of the points to the metal housing of the spark plug, thus obviating danger of corrosion at this point.

These and other objects including the special and simple construction of the spark plug will be more apparent from the following description r of the invention and the drawing forming part thereof and as more concisely pointed out in the appended claim.

In the accompanying drawing: Figure 1 is a side elevation of the spark plug according to the invention;

is also interiorly threaded at its upper end 4, for

engagement with a nut 6 sleeved upo'n'the body 17 and adapted to clamp the latter within the casing. When sleeve nut 6 is screwed home, its lower end engages the upper edge or face of a collar 5 on body member 7, and a shoulder 9 on the inner face of easing 2 is drawn upwardly into seating engagement with the lower edge or face of the collar.

The body member 7 of the spark plug is made of any suitable insulating material such as porcelain and is of substantially cone shape at its lower end to provide an annular space or chamber 10 between the casing and body to prevent a short circuit or jumping of the spark at this point. Two electrodes 11 and 12 are embedded in body 7 longitudinally thereof and with their upper and lower ends protruding therefrom. Electrode 11 is bent at an angle toward but slightly spaced from the lower end of electrode 12 to form the spark gap 13.- The upper ends of the electrodes are housed in recesses 14 and 15 formed in cap member 16 of insulating ma terial sleeved upon the body 7. Contact screws 5 or posts 17 and 18 extending laterally through the cap, engage the upper ends of the electrodes and provide means for respectively securing a lead wire.19 andv an adjustable secondary spark gap or contact member 20 to the plug, thumb nuts 21 being employed to clamp these members in place. The member 20 is formed with a 1ongitudinally disposed slot 22 through which post 18 extends thus permitting longitudinal as well as pivotal adjustment with respect to sleeve nut 6 when thumb nut 21 is loosened. The lower pointed end of member 20 is preferably provided with a platinum sparking point or terminal 23.

The operation of the plug is as follows: Current passes through the lead wire 19 into the electrode 11 and thence via the-path of least resistance across the gap 13 to electrode 12 and finally through contact member 20 across the readily visible gap 24 to the metallic sleeve nut 6, where it is grounded through the body of the engine 'BK thus producing the explosion spark. At the same time a visible spark will be produced at the out-.- side of the spark plug. In case the explosion spark is weak, the same can be readily intensified by in creasing the extent of gap 24 between contact member 20 and casing 2 of the spark plug. Thus member 20 will be moved longitudinally or pivotally until an adjustment is formed which gives the desired spark.

It will also be understood that the sight spark gap 24 can be completely shut off or eliminated by extreme adjustment of member 20 thereby permitting the car owner to readily determine the exact action of any particular cylinder of the engine. This can be extended to all of the spark plugs until each cylinder has been checked.

Having thus described our invention what we claim is:

A spark plug comprising a body of insulating material having a cone-shaped bottom portion, two electrodes embedded in said body having lateral screw-threaded end portions extending at opposite sides outwardly through the wall of the upper portion of said body and lower end portions extending through the bottom face of said body,

slidably to one of said electrodes, said contact member having its other end pointed and arranged in spaced relationship opposite said casing for forming a visible and adjustable spark gap between said last electrode and said casing.

ALEXANDER GUZIEL. ARNOLD KORFF. 

